source: trunk/src/corelib/animation/qpropertyanimation.cpp@ 846

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/*!
    \class QPropertyAnimation
    \brief The QPropertyAnimation class animates Qt properties
    \since 4.6

    \ingroup animation

    QPropertyAnimation interpolates over \l{Qt's Property System}{Qt
    properties}. As property values are stored in \l{QVariant}s, the
    class inherits QVariantAnimation, and supports animation of the
    same \l{QVariant::Type}{variant types} as its super class.

    A class declaring properties must be a QObject. To make it
    possible to animate a property, it must provide a setter (so that
    QPropertyAnimation can set the property's value). Note that this
    makes it possible to animate many of Qt's widgets. Let's look at
    an example:

    \code
        QPropertyAnimation *animation = new QPropertyAnimation(myWidget, "geometry");
        animation->setDuration(10000);
        animation->setStartValue(QRect(0, 0, 100, 30));
        animation->setEndValue(QRect(250, 250, 100, 30));

        animation->start();
    \endcode

    The property name and the QObject instance of which property
    should be animated are passed to the constructor. You can then
    specify the start and end value of the property. The procedure is
    equal for properties in classes you have implemented
    yourself--just check with QVariantAnimation that your QVariant
    type is supported.

    The QVariantAnimation class description explains how to set up the
    animation in detail. Note, however, that if a start value is not
    set, the property will start at the value it had when the
    QPropertyAnimation instance was created.

    QPropertyAnimation works like a charm on its own. For complex
    animations that, for instance, contain several objects,
    QAnimationGroup is provided. An animation group is an animation
    that can contain other animations, and that can manage when its
    animations are played. Look at QParallelAnimationGroup for an
    example.

    \sa QVariantAnimation, QAnimationGroup, {The Animation Framework}
*/

#include "qpropertyanimation.h"
#include "qanimationgroup.h"
#include "qpropertyanimation_p.h"

#include <private/qmutexpool_p.h>

#ifndef QT_NO_ANIMATION

QT_BEGIN_NAMESPACE

void QPropertyAnimationPrivate::updateMetaProperty()
{
    if (!target || propertyName.isEmpty()) {
        propertyType = QVariant::Invalid;
        propertyIndex = -1;
        return;
    }

    //propertyType will be set to a valid type only if there is a Q_PROPERTY
    //otherwise it will be set to QVariant::Invalid at the end of this function
    propertyType = targetValue->property(propertyName).userType();